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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
X/(3*x-5) = 1/2 // - 1/2
X/(3*x-5)-(1/2) = 0
X/(3*x-5)-1/2 = 0
(2*X)/(2*(3*x-5))+(-1*(3*x-5))/(2*(3*x-5)) = 0
2*X-1*(3*x-5) = 0
2*X-3*x+5 = 0
(2*X-3*x+5)/(2*(3*x-5)) = 0
(2*X-3*x+5)/(2*(3*x-5)) = 0 // * 2*(3*x-5)
2*X-3*x+5 = 0
2*X-3*x+5 = 0 // - 2*X+5
-3*x = -(2*X+5) // : -3
x = (-(2*X+5))/(-3)
x = (2*X+5)/3
x = (2*X+5)/3
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